The Square Root Of -15 Has Been Described As Useless

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The square root of negative fifteen has been described as useless, namely by the mathematician who discovered it. But this number, and other imaginary numbers, aren't totally useless, they're just misunderstood. When this square root was discovered, mathematicians just didn't understand the potential for imaginary numbers. Learn the whole story, and why they aren't useless, in the video below.


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